first, try doing a search within Bill Moyer's Journal online.
http://www.pbs.org/moyers/journal/index-flash.html That might narrow it down for you.
Don't search for TOO much - start with "minimum wage" and than add words that you are sure were in the original quote if you get to many hits.
Are you doing this for a class? Does your college or university library have access to Lexis-Nexis Academic? If the Moyers' quote was in a print article, you may be able to locate it through that source.
If you cannot find the Moyers' quote, consider looking for something similar from Barbara Ehrenreich. You should also consider reading, at the very least, her book "Nickeled and Dimed" which will give you a healthy handful of examples to support your argument (I assume you're arguing for a higher minimum wage).
Good luck with you paper (and watch your spelling - remember that "spell check" is NOT your friend, but the dictionary is!)